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1990—1993年在白石山林业局琵河林场进行了红松人工母树林最佳施肥量试验。结果表明，林龄30年左右的红松人工母树林密度320株／公顷时，每株施350g磷二铵效果最好。
During 1990-1993, the best fertilization experiment of Pinus koraiensis plantations was conducted in Pihe Forest Farm of Baishishan Forestry Bureau. The results showed that when the plantation density was 320 plants per hectare for the age of about 30 years of Pinus koraiensis plantation, the effect of applying 350g phosphorus diammonium per plant was the best.